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Leases and Prepaid Maintenance Deposits - Sale and Leaseback Transactions (Narrative) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Sale Leaseback Transaction [Line Items]  
Refund in pre-delivery deposits $ 53.2save_RefundinPreDeliveryDeposits
Spare engines  
Sale Leaseback Transaction [Line Items]  
Number of spare aircraft engines entered into sale and leaseback agreement 1save_SaleLeasebackTransactionNumberOfSpareAircraftEngines
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= save_SpareEnginesMember
Quick Engine Change Kit  
Sale Leaseback Transaction [Line Items]  
Number of units under capital lease 2us-gaap_CapitalLeasedAssetsNumberOfUnits
/ us-gaap_PropertyPlantAndEquipmentByTypeAxis
= save_QuickEngineChangeKitMember
Lease term 3 years
Aircraft  
Sale Leaseback Transaction [Line Items]  
Number of sale and leaseback transactions 31save_SaleLeasebackTransactionNumber
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= save_AircraftMember
Airbus A320  
Sale Leaseback Transaction [Line Items]  
Sale leaseback transaction, number of aircraft 8save_SaleLeasebackTransactionNumberOfAircraft
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= save_AirbusA320Member
Airbus A320 | Long-term assets  
Sale Leaseback Transaction [Line Items]  
Sale leaseback transaction on aircraft, net deferred gain (loss) $ 1.6save_SaleLeasebackTransactionDeferredLossNet
/ us-gaap_BalanceSheetLocationAxis
= us-gaap_OtherNoncurrentAssetsMember
/ us-gaap_SaleLeasebackTransactionDescriptionAxis
= save_AirbusA320Member